Question:
Which of the following is not an electrical insulator?
Which of the following is not an electrical insulator?
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Graphite conducts electricity due to delocalized electrons, so it is not an electrical insulator.
Updated On: May 7, 2026
- \(Al_2O_3\)
- Graphite
- Nylon
- \(Si_3N_4\)
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The Correct Option is B
Solution and Explanation
An electrical insulator is a material that does not allow electric current to pass easily.
Alumina:
\[
Al_2O_3
\]
is a ceramic electrical insulator.
Nylon is a polymer and is also an electrical insulator.
Silicon nitride:
\[
Si_3N_4
\]
is an advanced ceramic with good insulating properties.
Graphite is different.
Graphite is a form of carbon with layered structure.
In graphite, electrons can move within layers.
Because of these mobile electrons, graphite conducts electricity.
Therefore, graphite is not an electrical insulator.
Hence, the correct answer is:
\[
\text{Graphite}.
\]
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